Bono and band discuss song that changed U2

The new trailer is out for "The Sky Down," a behind-the-scenes-look at the creation of U2's album "Achtung Baby." The documentary, which airs on Oct. 29 on Showtime, covers the critical moment when the band was struggling to stay relevant.

The trailer includes vintage clips from the studio in Berlin, where the band gathered in the early '90s to work on what would become "Achtung Baby."

"Something happened on 'Achtung Baby' that was the pivot point," says Bono. "Making 'Achtung Baby' was the reason why we are still here now."

Bono and The Edge will both be performing at the upcoming concert celebrating President Bill Clinton's charitable efforts. They join Lady Gaga and Usher for "A Decade of Difference" on Oct. 15. You can watch them live, starting at 7 p.m. PT, only on Yahoo!